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    <title>Document</title>
    <style>
        div {
            width: 300px;
            height: 200px;
            /* border-width   边框的粗细，一般情况下用px做单位 */
            border-width: 5px;
            /* border-style     边框的样式，solid（实线边框）、dashed(虚线边框)、dotted(点线边框) */
            border-style: dashed;
            /* border-color     边框的颜色 */
            border-color: pink;
        }
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<body>
    <div>

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